摘要
通过对橡胶沥青进行电镜分析,认为橡胶沥青形成机理可以解释为胶粉与基质沥青在高温条件下混合后同时发生物理和化学两种反应。胶粉颗粒发生物理溶胀反应,同时胶粉颗粒表面与基质沥青形成凝胶体,彼此相连形成似网状结构。对不同规格胶粉、不同胶粉掺量、不同反应时间和不同反应温度所生成的橡胶沥青进行对比试验,并对橡胶沥青混合料的性能以及路面指标进行了检测。结果表明：胶粉粒径对橡胶沥青指标以及存储性能有一定影响,应使用20~40目载重汽车子午胎胶粉;胶粉掺量越大,橡胶沥青粘度越高,在确保施工可行性的前提下应尽可能增大胶粉掺量;同时反应温度和反应时间对橡胶沥青的指标有较大影响,建议反应温度控制在180~190℃,反应时间45 min左右,不宜超过4 h。
Based on the results of electron microscope observation,the formation mechanism of rubber asphalt can be explained as follows： Both chemical and physical reactions take place when crumbed rubber and base bitumen are mixed together at high temperature.Physical swelling of the crumbed rubber particles takes place during the process,at the same time a layer of gel forms on the surface of crumbed rubber particles and base bitumen,through which the particles connect with each other and a network structure is formed.A series of contrast tests on rubber asphalt made of different sizes of crumbed rubber,different crumbed rubber contents,different reaction time and different reaction temperatures was carried out.The properties of the rubber asphalt mixtures and the pavement performance were tested.The test results show that（1） the size of crumbed rubber has a certain impact on rubber asphalt index and its storage property,crumbed rubber of 20 to 40 mesh made of radial tire of auto truck should be used;（2） the higher the crumbed rubber content is,the higher the asphalt rubber viscosity is,so crumbed rubber content should be as much as possible under the condition that the feasibility of the construction can be ensured;（3） both reaction temperature and time have considerable influence on asphalt rubber index,so reaction temperature should be controlled around 180~190 ℃,with reaction time around 45 min,no more than 4 h.
出处
《公路交通科技》
CAS
CSCD
北大核心
2011年第1期25-30,共6页
Journal of Highway and Transportation Research and Development
关键词
道路工程
橡胶沥青
电镜
机理
似网状结构
road engineering
rubber asphalt
electron microscope
mechanics
semi-network structure
